Hammer



Apr. 3, 1923. 11,450,849

(3. GREEN HAMMER Filed June 6, 1921 2 sheets-sheet l WITNESS:

ATTO RN EY Apr. 3, 1923.

C. GREEN HAMMER Filed June 6, 1921 o o [M O o /a ,fio'

Maw w 2 sheets-sheet 2 INVENTOR ATTORNEY Patented Apr. 3, 1923.

"rare arena r sins.

CHARLES GREEN, OF MUSCATINE, IOWA, ASSIG-NOR OF ONE-FOURTH TO EVER'I F.RIGHMAN AND ONE-FOURTH TO CHARLES J'. RICHMAN, BOTH OF MUSCATINE,

IOWA.

HAMMER.

Application filed June 6, 1921. Serial No. 475,523.

To all whom it may concern Be it known that 1, CHARLES GREEN, a citizenof the United States, residing at Muscatine, in the county of Muscatineand State of Iowa, have invented new and useful Improvements in Hammers,of which the following is a specification.

This invention relates to power hammers and has for its object theprovision of a novel and efficient power hammer which is provided withmeans controllable by the operator whereby the length of stroke andconsequently the power of the blow may be regulated to suit differentconditions at the will of the operator even while the device is in fulloperation.

An important object is the provision of a device of this character whichis also provided with means readily operable by the user whereby thedevice may be thrown into and out of operation in a very simple andefficient manner. 1

Another object is the provision of a device of this character which isprovided with cushioning means whereby the shock of the operation of thelever carrying the hammer may be effectively cushioned or absorbed.

A further object is the provision of a device of this character which isso constructed as to involve the use of merely a small number of parts,the fewness of the parts together with their peculiar constructionrenderingthe device readily repairable in the case of derangement.

An additional object is the provision of a device of this characterwhich will be simple and inexpensive in manufacture, highly efficient inuse, durable in service and a general improvement in the art.

With the above and other objects and advantages in view, the inventionconsists in the details of construction to be hereinafter more fullydescribed and claimed, and illustrated in the accompanying drawings inwhich, i

Figure 1 is a side elevation of the device.

Figure 2 is a front elevation.

Figure 3 is a plan view of the hammer end of the operating lever.

Figure 4 is a horizontal sectional view taken on a plane considerablybelow the operating lever.

Figure 5 is a vertical cross-sectional view taken through the pivotalconnection of the lever with its support.

Figure 6 is a vertical sectional view taken through the drive shaft, and

Figure 7 is a detail horizontal section through the operating rod takenimmediately above the rocking lever.

Referring more particularly to the drawings I have shown my device ascomprising a suitable base 10 from one end of which rises a verticalupright 11 and from the intermediate portion of which rises an upright12. Secured upon the upper end of the upright 11 is an anvil member 13and also secured upon the rear base of the upright 11 is a verticallyextending guide 14: formed at its intermediate portion with an elongatedslot 15 and having secured to its upper end portion a pair of forwardlyextending space guide yokes 16. Slidable through these yokes 16 is avertically movable bar 17 carrying a hammer head 18 disposed above andcooperating with the anvil 13.

Secured upon the upper end of the upright support 12 is a bearing member19 which is pivotally connected as shown at 20 with a bearing member 21secured to the intermediate portion of an operating lever 22. Theforward end of this lever 22 is bifurcated for straddling engagementupon the bar 17 and is formed with slots 23 through which passes a pin24 extending transversely through the bar 17 whereby' to constitute anoperative connection between this operating lever and the hammer bar.The rear end of the lever 22 is bifurcated as shown and is formed withslots 25 for a purpose to be described.

It is not an essential feature of the invention but it is well tomention in passing that I prefer to employ braces 26 connected. with theupper end of the upright 12 and with the upper end of the guide 14. Ialso provide braces 27 connected with the lower portion of the guide 14and with the lower one of the yoke 16 whereby to provide strength. Inactual practice it may likewise be found advisable to provide braces 28connected with the lower portion of the upright 11 and with the upperportion of the upright 12 whereby to hold these members relativelyrigid.

Secured upon the base 10 rearwardly of posed upon the anvil.

the springs39 and 4:1 cushion the shock and the upright 12 are bearings29 through which is journaled a shaft 30 provided at one end with abalance wheel 31 and pro vided at its other end with a pulley 32 aboutwhich is trained a belt 33 driven by any suitable power device, notshown.

Secured upon the intermediate portion of the shaft 30 is an eccentric 34encircled by an eccentric strap 35 which is connected with the lower endof avertically rcciprocatory rod 36 which is slidable through a block 37disposed within the bifurcation at the rearend of the lever 22. Thisblock 37 carries oppositely extending trunnions 38 which pass throughthe slot 25 as shown. Dis posed upon the rod 36 is a coil spring 39which has its lower end abutting against the block 37 and which hasitsupper end abutting against a nut 40 threaded onto the upper extremityof the rod 36; Also encircling the rod 36 is a coil spring 11 which hasits upper end abutting against the under side of the block 37 and whichhas its lower end abutting against a stop-collar 42 secured upon the rod36. By this construction it will be seen that when the shaft 30 isrotated the rod 36 will be reciprocated' vertically and this will resultin swinging the lever 32 to bring the hammer member 18 carried therebyinto engagement with the anvil13 or'into engagement with'work dis- It isto be noted that avoid breaking the parts when the machine is inoperation. that by adjusting the nut 40 the degree of tension ofthesprings may beregulated to meet varying conditions.

In order that the machine may be readily controlled, that is thrown intoor out of gear as may bedesired, I provide a yoke 43 pivoted'uponthebase 10 at the rear of the shaft 30 and carrying a. roller 4L4 whichengages against the rear side of the rear stretch of thelo'elt 33.Pivoted upon the forward portion of thebase 10 is a treadle member 15which'is angular in shape and which has the fr'ee'end of its rearmostarms connected'witli the upper portion'of the yoke 43 by means ofsuitable links 46. It will be seen that when theoperator presses uponthe t-readlc 45 and ellie'cts rocking of the treadle the links 46 willpull upon the yoke 43 and move the roller 44 into closeengagcment withthe rear stretch of the belt so that the belt will grip the pulley 32with a sufficient degree of friction to insure rotation of the shaft 30for driy'ing the machine.

In order that tl'le'degree of movement of the lever 22 may be regulated,I provide a link 47 slidable along one side of the rear endofthe lever22 and pivotally connected witlrtheprojecting end of one oi thetrunnions 38. Secured upon the rear side oi. the upright 12 is asupporting bracket 48 It is also to be observed upon which is pivoted alever 49 which has its upper end pivotally and slidably con nected withthe forward end. of the link 47 and which has its lower end pivotallyconnected with alink 50 which is in turn pivotally connected with alever 51 having a grip actuated pawl mechanism 52 cooperating with anotch segment 53 secured at the forward end of the base 10.

In the operation of the device it will be seen that when the operatorpresses upon the treadle 45 the yoke l3 will be moved forwardly to bringthe roller n thereof against the rear stretch of the belt 33 so that theshaft 30 will be operated. I -Then this shaft 30 rotates, the eccentric34 carried thereby will effect vertical reciprocatory movement of therod 36 and this will of course cause the rocking movement of the lever22 so that the hammer member 18 thereof will co operate with the anvilfor producing a hanr mering action upon any Work disposed upon theanvil. As stated above the provision of the springs 39 and 41 isimportant as it pro vides the proper cushioning effects so as to take upthe shock or jar and to permit a certain amount of lost motion at therear of the lever to avoid breaking any of the parts, Whenever it isdesired to vary the degree of. movement of" the hammer member or the lever 22 which carries the hammer member, it is merely necessary that theoperator move the lever 51 so that the pawl 52 thereof will be engagedwithin the desired one of the notches This movement of the lever 51-results inmovement of the link 50; lever 49 and link 47 and this will ofcourse change the position of the block 37 within-the bifurcation at therear end of the lever so that the leverage exerted upon the lever willbe varied; It is of course apparent that the de gree of movement of theblock 37 with re spect to the lever 22 is controlled entirely by thelengthof the slots 25 in the lever.

From the foregoing description and a study of the drawings it'will beapparent that I have thus provided a simply constructed and consequentlyinexpensive machine which will be very efiicient and powerful in actionas a power hammer; which is provided with novel and effectual cushioningmeans, which includes means whereby the device may be thrown into or outof gear at an instantsn'otice, and which is moreover provided witha'very simple devicewhereby the degree of movement of the hammer membermay be varied to meet difierentIconditions.

While I have shown and described the preferredembodiment of theinvention, it is of course to be understood thatI reserve the right tomake such changes in the form, construction and arrangement of parts aswill not depart from the spirit of the invention or the scope of the:subj oined'claims.

iii)

Having thus described my invention I claim:

1. A device of the character described comprising a base, a pair ofuprights rising therefrom, an anvil member on one of said uprights, alever pivoted upon the other upright and having its forward end providedwith a hammer cooperating with said anvil, the rear end of said leverbeing bifurcated and formed with longitudinal slots, a shaft journaledupon said base, means for rotating said shaft, a cam on said shaft, aneccentric strap encircling said cam, a rod connected with said strap, ablock engaged upon said rod and having trunnions disposed through saidslots, and means for moving saidtrunnions along said slots whereby tovary the leverage upon said lever.

2. A device of the character described comprising a-base, a pair ofuprights rising therefrom an anvil. member on one of said uprights, alever pivoted upon the other upright and having its forward end providedwith a hammer cooperating with said anvil, the rear end of said leverbeing bifurcated and formed with longitudinal slots, a shaft journaledupon said base, means for rotating said shaft, a cam onsaid shaft, aneccentric strap encircling said cam, a rod connected with said strap, ablock engaged upon said rod and having trunnions disposed through saidslots and means for moving said trunnions along said slots whereby tovary the leverage upon said lever, astop-collar on said rod below saidlever, a nut threaded upon the upper end of said rod, and springsencircling said rod and engaging against said stop collar and the blockand against said nut and the block respectively.

3. A device of this character described comprising a base, a pair ofuprights rising therefrom, an anvil member on one of said uprights, alever pivoted upon the other upright and having its forward end providedwith a hammer cooperating with said anvil, the rear of said lever beingbifurcated and formed with longitudinal slots, a shaft journaled uponsaid base, meams for rotating said shaft, a cam on said shaft, aneccentric strap encircling said cam a rod connected with said strap, ablock engaged upon said rod and having trunnions disposed through saidslots, and means for moving said trunnions along said slots whereby tovary the leverage upon said lever, said means comprising a lever pivotedupon the base, a second lever pivoted .upon said second named uprightand connected with said second named lever, and a link connected withthe upper end of said last named lever and with one of said trunnions.

In testimony whereof I affix my signature.

CHARLES GREEN.

